.wrapper{
    margin: 0 auto;
    width: 1200px;

}

body{
    background-color: #f3f5f7;
}

/* 头部区域 */
.header{
    height: 100px;
    background-color: #fff;
}

.header .wrapper{
    padding-top: 29px;
    display: flex;

}

.logo a{
    display: block;
    width: 195px;
    height: 41px;
    background-image: url(../images/logo.png);
    font-size: 0;
}
.nav{
    margin-left: 102px;
}
.nav ul{
    display: flex;
}
.nav li{
    margin-right: 24px;
}
.nav li a{
    display: block;
    padding: 6px 8px ;
    line-height: 27px;
    font-size: 19px;

}


/* acvie 类选择器，表示默认选中的a */
.nav li .active,.nav li a:hover{
    border-bottom: 2px solid #00a4ff;
}



/* 搜索 */
.search{
    display: flex;
    margin-left: 64px;
    padding-left: 19px;
    padding-right: 12px;
    width: 412px;
    height: 40px; 
    background-color: #f3f5f7;
    border-radius: 20px;
}
.search input{
    flex: 1;
    width: 360px;
    height: 38px;
    border: 0;
    background-color: transparent;
    /* 去掉了表单控件的焦点框 */
    outline: none;
}
.search input::placeholder{
    font-style: 14px;
    color: #999;
}

.search a{
    align-self: center;
    width: 16px;
    height: 16px;
    background-image: url(../images/search.png);
}



/* 用户 */
.user{
    margin-left: 32px;
    margin-top: 4px;
}

.user img{
    margin-right: 7px;
    /* vertical-align 行内块和行内垂直方向对齐方式 */
    vertical-align: middle;
}
.user span{
    font-style: 16px;
    color: #666;
}



/* banner */
.banner{
    height: 420px;
    background-color: #0092cd;
}

.banner .wrapper{
    display: flex;
    justify-content: space-between;
    height: 420px;
    background-image: url(../uploads/banner.png);
}

.banner .left{
    padding: 3px 20px;
    width: 191px;
    height: 420px;
    background-color: rgba(0,0,0,0.42);
}

.banner .left a{
    /* 块级，宽度是父级的100% */
    display: block;
    height: 46px;
    background: url(../images/right.png) no-repeat right center;
    line-height: 46px;
    font-size: 16px;
    color: #fff;
}

.banner .left a:hover{
    background-image: url(../images/right_hover.png);
    color:  #00a4ff;
}

/* 课程表 */
.banner .right{
    margin-top: 60px;
    width: 218px;
    height: 305px;
    background-color: #209dd5;
    border-radius: 10px;
}

.banner .right h3{
    margin-left: 14px;
    height: 48px;
    line-height: 48px;
    font-style: 15px;
    color: #fff;
    font-weight: 400;
}

.banner .right .content{
    padding: 14px;
    height: 257px;
    background-color: #fff;
    border-radius: 10px;

}

.banner .right dl{
    margin-bottom: 12px;
    border-bottom: 1px solid #e0e0e0;
}

.banner .right dt{
    margin-bottom: 8px;
    font-style: 14px;
    line-height: 20px;
    font-weight: 700;
}

.banner .right dd{
    margin-bottom: 8px;
    font-style: 12px;
    line-height: 16px;
}

.banner .right dd span{
    color: #00a4ff;
}
.banner .right dd strong{
    color: #7d7d7d;
    font-weight: 400;
}

.banner .right a{
    display: block;
    height: 32px;
    background-color: #00a4ff;
    text-align: center;
    line-height: 32px;
    font-style: 14px;
    color: #fff;
    border-radius: 15px;
}

/* 精品推荐 */
.recommend{
    display: flex;
    padding: 0 20px;
    margin-top: 11px;
    width: 1200px;
    height: 60px;
    background-color: #fff; 
    box-shadow: 0 1px 2px 0 rgba(211,211,211,0.5);
    line-height: 60px;
}

.recommend h3{
    font-style: 18px;
    color: #00a4ff;
    font-weight: 400;
}

.recommend ul{
      /* 除去标题和修改兴趣的尺寸，父级剩余尺寸都给ul，实现把修改兴趣挤到最右侧 */
    flex: 1;
    display: flex;
}

.recommend ul li a{
    padding: 0 24px;
    border-right: 1px solid #e0e0e0;
    font-size: 18px;
    
}

.recommend ul li:last-child a{
    border-right: 0;
}

.recommend .modify {
  font-size: 16px;
  color: #00a4ff;
}

/* 推荐课程 */
.course {
  margin-top: 15px;
}

/* 标题 - 公共类，与其他区域共用 */
.hd {
  display: flex;
  justify-content: space-between;
  height: 60px;
  line-height: 60px;
}

.hd h3 {
  font-size: 21px;
  font-weight: 400;
}

.hd .more {
  padding-right: 20px;
  background: url(../images/more.png) no-repeat right center;
  font-size: 14px;
  color: #999;
}

/* 课程内容 - 公共类 */
.bd ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.bd li {
  margin-bottom: 14px;
  width: 228px;
  height: 271px;
  background-color: pink;
}


.bd li .pic{
    height: 156px;
}

.bd li .text{
    padding: 20px;
    height: 115px;
    background-color: #fff;
}

.bd li .text h4{
    height: 40px;
    margin-bottom: 13px;

    font-size: 14px;
    line-height: 20px;
    font-weight: 400;
}

.bd li .text p{
    font-size: 14px;
    line-height: 20px;
    color: #999;
}

.bd li .text i{
    font-style: normal;
}

.bd li .text p span{
    color: #fa6400;
}

/* 前端 */
.hd ul{
    display: flex;

}

.hd li{
    margin-right: 60px;
    font-size: 16px;

}

.hd li .active{
    color: #00a4ff;
}

.bd{
    display: flex;
    justify-content: space-between;
}

.bd .left{
    width: 228px;
}

.bd .right{
    width: 957px;
}

.bd .right .top{
    margin-bottom: 15px;
    height: 100px;
}


/* 版权 */
.footer{
    margin-top: 60px;
    padding-top: 60px;
    height: 273px;
    background-color: #fff;
}

.footer .wrapper{
    display: flex;
    justify-content: space-between;

}

.footer .left{
    width: 440px;
}

.footer .left p{
    margin-top: 24px;
    margin-bottom: 24px;

    font-size: 12px;
    line-height: 17px;
    color: #666;
}

.footer .left .download{
    display: block;
    width: 120px;
    height: 36px;
    border: 1px solid #00a4ff;
    text-align: center;
    line-height: 34px;
    font-size: 14px;
    color: #00a4ff;
}

.footer .right{
    display: flex;
}

.footer .right dl{
    margin-right: 130px;
}

.footer .right dt{
    margin-bottom: 12px;
    font-size: 16px;
    line-height: 23px;
}

.footer .right a{
    font-size: 14px;
    color: #666;
    line-height: 24px;
}
